I have several blackberry devices and I do all their OS upgrades in the same desktop. Works fine with me. Just don't forget to delete the vendor.xml file each time you load a newer OS.
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9700 Unlocked BES
App:5.0.0.979 Plt:5.1.0.177
8900 Unlocked BIS
App:5.0.0.822 Plt:5.2.0.76
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